Personalized icons/folders

Hi everyone!
I'm trying to organize my folders, and it seems to me that this'd be a lot easier to have personalized folders. For example, for Aperture I have a folder on an external HD with all the photos: something linke this /Pictures/2006/.
Here's the problem: I know how to change the icon for Pictures folder and 2006 folder, but inside this one I've got a lot of subfolders, and I don't want to change it one by one... Anyway to solve this?
Also, is there a way to have the same icon on the subfolder whenever I create a new one?